Roof-ventilator joint



"C. C. SHIPP.

ROOF VENTILATOR JOINT. APPLICATION FILED iAN.28, 1919.

Patented Apr. 1", 1920.

W ATTORA/EK UNITED STATES PATENT OFFICE.

; CLARENCE C. SHIPP, 0F INDIANAPOLIS, INDIANA.

ROOF-VENTILATOR JOINT.

Application filed. January 28, 1919.

'1 b all whom it may concern:

Be it known that I, CLARE-Non C. SHIPP, a citizen of the United States,residing at Indianapolis, in the county of Marion and State of Indiana,have invented certain new and useful Improvements in Roof-VentilatorJoints, of which the following is a specification.

This invention relates to certain improvements in a self sealing jointbetween the overlapping ends of that class of. roof ventilatorscomprising an air exhaust duct and a hollow horizontally disposed revoluble hood wherein the normal air currents are directed transverselyacross the longitudinal axis of the duct for inducing an artificialdraft through the latter; and one of the objects of the inventionconsists in the provision of a self sealing joint of the above characterwhereby the intervening space between the overlapped ends of the ductand hood is sealed against the induction of air which in effect wouldimpair the efficiency of the vacuum at the discharge end of the duct andwithin the hood.

A further object of the invention consists in the provision of a jointof the above character which will impose a minimum frictionalresistance; be simple in construction, efficient in operation, easy torepair and economical to manufacture.

I accomplish the above objects of the invention by means of theconstruction illustrated in the accompanying drawings forming a parthereof, in which- Figure 1 is a view partly in elevation and partly invertical section of a roof ventilator of the revoluble hood type, withmy improved self sealing joint embodied therein. 2 is an enlargedsectional detail view of the overlapped ends of the stationary ventilator duct and hood, showing more clearly the construction andarrangement of my improved oint.

Referring to the drawings, 10 represents the vertically disposedstationary ventilator duct which projects through the roof of thebuilding. The revoluble hood comprises a vertically disposed tube 11which, while forming a continuation of duct 10, is larger in diameterthan the latter end is arranged so that its lower end overlaps the upperend of duct 10, as shown. Tube 11 communicates with a horizontallydisposed pipe 12 having a truncated cone 13 arranged therein the base ofthe cone being secured to the Specification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 273,588.

inner surface and near one end of pipe 12. A vane 15 is secured to thetop of pipe 12 for constantly maintaining the enlarged end of cone 13adversely to the normal travel of the prevailing air currents, and asthese currents discharge from the reduced end of cone 13 a verticallymovable draft is induced in ventilating duct 10. As the induced draftthrough duct 10 is the result of a vacuum of slightly varying degrees ofintensity within tube 11, this vacuum is easily impaired depending onthe amount of air admitted other than at the inlet end of duct 10, sothat the efficiency of this type of ventilator as a ventilating mediumis considerably reduced. The above objections are the result of thenecessary loose oint between the walls of the overlapping ends of theduct and tube. leaving the hood free to readily shift position as theair currents change their direction of travel. To overcome the badeffect of the loose joint above mentioned and still permit free actionof the hood is one of the chief features of the present invention, andthis I accomplish by providing a simple self sealing joint comprising aring 20 which is composed of yieldable material such as felt or otherfabric which is bent down over the edge of the upper end of duct 10, asshown in the drawings, and ring 20 is held against accidentaldisplacement by means of a collar 21. The outer portion of the felt orfabric ring 20 extends outwardly from the outer peripheral wall of duct10 and in a downwardly inclined angle with he peripheral edge of thering slightly contacting the internal wall of tube 11 of the hoodthrough its contact with the raised surface of an outwardly disposed rib22 formed in the wall and near the upper end of duct 10. By means of itsyieldability felt ring 20 is readily susceptible of movement under theinfluence of the vacuum above it in tube 11, so that the more readilythe air is removed from tube 11 the more firmly the peripheral edge ofcollar 20 will bear against the adjacent internal wall of said tube.

The revoluble hood, comprising tube 11 and pipe 12, is retained inoperative position by means of a vertically disposed shaft 25 which issupported by the hood by means of the radial arms 26. Shaft 25 is alsopro vided with a cone-bearing member 27 which rides on a ring 29supported on balls 30 which are arranged in the upper end of a a Patent,is

stationary sleeve 31, and the latter is supduct, a revoluble hoodoverlapping the adported in duct by the radial arms 32. jacent end ofsaid duct, yieldable means The lower end of shaft 25 is arranged in ayieldingly moving under the influence of the stationary sleeve 33 whichis secured to duct draft through the duct for closing the space 10 bymeans of the radial arms 3%. The between the adjacent walls of theoverlapped lower end of sleeve 33 affords a seat forsuitends of the ductand hood, and means for able balls 35, and the lower end of shaft 25preventing accidental displacement of said is provided with acone-bearing member 36 yieldable means, which contacts a bearing ring 37riding 3. A ventilator of the class described comagainst the balls 35,so that the two bearings prising an air exhaust duct, a revoluble hoodconstantly hold the shaft 25 in vertical opoverlapping the adjacent endof the duct erative position. and receiving the discharge of the latter,Having thus fully described my said inand a yieldable means arrangedbetween the vention, what I desire to secure by Letters adjacent wallsof the overlapped ends of the duct and hood and actuated by the draft l.A ventilator oi the class described comthrough the hood for closing thespace prising an air exhaust duct, a revoluble against leakage of airbetween the adjacent hood overlapping the adjacent end of the walls ofthe overlapped ends of the duct duct and receiving the discharge of thelatand hood. ter, and a yieldable means having movement In witnesswhereof I have hereunto set induced by the upwardly moving draft in myhand and seal at Indianapolis, Indiana, the duct for closing the spacebetween the this 25th day of January, A. D. one thou adjacent walls ofthe overlapped ends of sand nine hundred and nineteen. the duct andhood.

CLARENCE C. SHIPP. [L. s]

2. A ventilator comprising an air exhaust V

